Energy storage battery balancing system

How does battery balancing work?

Battery balancing depends heavily on the Battery Management System. Every cell in the pack has its voltage (and hence SOC) monitored, and when imbalances are found, the pack's SOC is balanced. Passive balancing and active balancing are the two basic approaches to battery balancing.

Why is SoC balancing important in EV battery pack?

After performing cell balancing, each cell's SoC reaches 60 % (average SoC) which signifies that all cells have reached to same level or balanced. Therefore, SoC balancing is crucial in EV battery pack to increase the usable capacity. Fig. 3. Charge among five cells connected in series before and after SoC balancing.

How does cell imbalance affect the performance of a battery energy storage system?

The performance of a battery energy storage system is highly affected by cell imbalance. Capacity degradation of an individual cell which leads to non-utilization for the available capacity of a BESS is the main drawback of cell imbalance.

Does cell balancing improve battery efficiency?

The research delved into the characteristics of active and passive cell balancing processes, providing a comprehensive analysis of different cell balancing methodologies and their effectiveness in optimizing battery efficiency.

Can passive and active cell balancing improve EV battery range?

Consequently, the authors review the passive and active cell balancing method based on voltage and SoC as a balancing criterion to determine which technique can be used to reduce the inconsistencies among cells in the battery pack to enhance the usable capacity thus driving range of the EVs.

What is a model based balancing system?

The battery string consists of n battery cells connected in series. A MOSFET is connected in parallel to each battery cell to realize the balancing function. The model based balancing control module measures the current of the battery string and voltages of all the battery cells. Fig. 1. The schematics of the model based balancing system.